Signals convey information mathematically as a function of time and systems produce output signals in response to input signals. There are four basic types of signals: 1) Continuous in both time and value, 2) Continuous in time but discrete in value, 3) Continuous in value but discrete in time, 4) Discrete in both time and value. The document defines signals, systems, and describes the four basic types of signals.

1. SIGNALS AND SYSTEM

2. CONTENT
1.Defination of signals.
2.Defination of systems.
3.Basic type of signals

3. SIGNALS
• The basic defination of signals is the physical
quantitiy that convey the information.
In technical language
Signals are expressed mathematically as function
of independent variable which is usually “TIME”
f(t)
t

4. SYSTEM
• A system is any process that produces an
output signal in response to an input signal.
system
{ }²Input X[t] output Y[t]
={X(t)}²

5. BASIC TYPE OF SIGNALS
1. Continious time and continious in value signal.
2. Continious in time but descrete in value.
3. Continious in value but descrete in time.
4. Descrete in time & descrete in value.

6. CONTINIOUS IN TIME AND CONTINIOUS IN VALUE
In this case the continuity of time and value is exist.
0 2 4
t
f(t )
+5v
-5v

7. CONTINIOUS IN TIME BUT DESCRETE IN VALUE
In this case the only time is in continuity is exist
but discrete in value
+5v
-5v
f(t)
t

8. CONTINIOUS IN VALUE BUT DISCRETE IN TIME
In this case the we get continuity value of f(t) but
the time is in discrete.
f(t)
t
p(t)
t

9. Discrete in value and discrete in time
In this case the time and value are both in discrete.

10. Thank you
SOMEN DAS